Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-02-18
Mon.Not.Roy.Astron.Soc. 345 (2003) 545
Astronomy and Astrophysics
Astrophysics
Replaced with the accepted version to appear in MNRAS
Scientific paper
10.1046/j.1365-8711.2003.06960.x
The current observations are usually explained by an accelerating expansion of the present universe. However, with the present quality of the supernovae Ia data, the allowed parameter space is wide enough to accommodate the decelerating models as well. This is shown by considering a particular example of the dark energy equation-of-state $w_\phi\equiv p_\phi/\rho_\phi=-1/3$, which is equivalent to modifying the \emph{geometrical curvature} index $k$ of the standard cosmology by shifting it to $(k-\alpha)$ where $\alpha$ is a constant. The resulting decelerating model is consistent with the recent CMB observations made by WMAP, as well as, with the high redshift supernovae Ia data including SN 1997ff at $z= 1.755$. It is also consistent with the newly discovered supernovae SN 2002dc at $z=0.475$ and SN 2002dd at $z=0.95$ which have a general tendency to improve the fit.
No associations
LandOfFree
Is the present expansion of the universe really accelerating? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Is the present expansion of the universe really accelerating?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Is the present expansion of the universe really accelerating? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-501260